I get? What do I need to know? I have been researching, well, trying to, find out what kind of things I need to put in that will sound good. I've head a lot of good things about MTX subs and amps and have seen a few listed on Ebay. Do I need to buy speakers as well, based on the stock audio system already in it or will a sub(s), preferably (2) 12 inch and an amp do the job and sound good? If so, what size, how much power, etc.?